Calibration of GTN damage constitutive parameters of new aluminum alloy material
Based on a new aluminum alloy material,the round bar and flat specimens were designed,and the dynamic uniaxial tensile ex-periments were performed using the electronic universal tensile machine.Based on the GTN damage constitutive model,the evolution process of damage parameters was simulated by ABAQUS software,and the influence laws of damage parameters on the variation trend of load-displacement curves and the fracture time of material were revealed.Based on the round bar tensile experiments,the damage parame-ters of GTN damage constitutive model of the new aluminum alloy were calibrated by using the central composite experimental design and the reverse optimization method.The initial void volume fraction is 0.0015,the void nucleation volume fraction is 0.02,the critical void volume fraction is 0.15,and the complete fracture volume fraction is 0.25.Using the calibrated GTN damage constitutive parameters,the failure fracture process and fracture position of the plate specimen were simulated and tested.The results show that the experimental and the simulated load-displacement curves are in good agreement.
new aluminum alloyGTN damage constitutivedamage evolutionfracture analysis
NETL
NSTL
万方数据
